| http://www.w3.org/ns/prov#value | - , b, c and d are integers having the values 1 or 4, subject to the proviso that the total (a+b+c+d) is 4 and subject to the proviso that a, b, c or d can only assume a value of 4 if X and/or Y is fluorine and if, at the same time, q is 1, 2 or 3, and in which, finally, n is 1 or 2 and q is 0, 1, 2 or 3, r and t are an integer from 0 to 5, the total (q+r+t) having the value (n+4) and, in the event
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